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Basis of Presentation (Unaudited) (Table)
 6 Months Ended
Jun. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
$ in millions
June 30,
2013
 
December 31,
2012
Unamortized benefit plan costs, net of tax benefit of $3,044 as of June 30, 2013, and $3,149 as of December 31, 2012
            $
(4,631
)
 
            $
(4,790
)
Cumulative translation adjustment
(3
)
 
4

Net unrealized loss on marketable securities and cash flow hedges, net of tax benefit
(1
)
 
(1
)
Total accumulated other comprehensive loss
            $
(4,635
)
 
            $
(4,787
)